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You might look for some free accounting script and look at how they design the databases as a start. If you have a client, you can get reports from them to see what fields matter to them. Then, using good OO analysis and design principles, you can reverse-engineer the database design from your client's needs.

IMO, if you are coming here asking for help finding database designs for an accounting program, you might want to start learing how to program with something a little bit smaller as accounting programs are very large and somewhat complex.